I would say your 3.5 is great, don't sweat it! But for your current year and the next, adding up experience will be helpful for grad school admission. Real world and/or laboratory experience will do just fine. If you are focusing more on a research based grad program, consider doing some research with your university. However, if you are planning to attend a grad program that is more experiential/counseling based, then what you are doing now will suit you nicely. Hope this is helpful. good luck in your future endeavors ;-)